About privacy.

What information does this edition use?

• Account creation, login and payments are not yet active. This site does not request email addresses, passwords or card details.
• Your dark, light or system theme preference is saved in your browser’s local storage. No account is needed for this preference.
• Simulation calculations run in your browser. Downloaded Excel files are generated in your browser; simulation data is not sent to a server.
• This package contains no advertising or third-party analytics code. Cloudflare, which serves the site, may process connection and technical access data under its own terms to provide and secure the service.
• Guided experiment notes are stored only in your browser’s local storage and are not sent to a server. Avoid personal information on shared devices. You can download notes as text; clearing browser data may also erase them.

When membership, payments or visitor analytics are added, this notice will be updated to reflect the services used and the associated data processing.

Last updated: 19 October 2026.